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 - ABDO College

Worked Problems in Ophthalmic Lenses


The Kindle version can be purchased via Amazon here for £18

(3rd edition)

A H Tunnacliffe BA PhD Dip Maths DCLP FCOptom and G D Janney FBDO

Published by the Association of British Dispensing Opticians

150 pages, 145 figures


ISBN – 9780900099175

Mathematically based problems fully worked and explained. Numerous narrative style answers including definitions and examination-type questions.


  • Background Optical Principles
  • Thin Lens and Surface Powers
  • Cylindrical and Sphero-Cylindrical Lenses
  • The Lens Measure, Sag and Thickness
  • Ophthalmic Prisms
  • Prismatic Effects
  • Minimum Size of Uncut and Field Of View
  • Bifocals and Trifocals
  • Protective Lenses
  • Obliquely Crossed Cylinders
  • Lens Form and Effectivity
  • Best Form Lenses

Essential reading for the following ABDO College courses:

  • Fellowship Dispensing Diploma
  • Foundation Degree in Ophthalmic Dispensing